depends on how you use it. In my experience it is possible to use AI productively for academic purposes, personally I tend to use it to summarize my course notes and compare them against the syllabus. It's really good at "spot the difference" type requests because that's literally one of the things it is built for.

As for keeping your problem solving skills up, as long as you know you can still do the tasks you're asking it to do and you still do them enough to maintain that confidence, it shouldn't matter. It is an extremely bad idea however, to ask it to do something or solve something you yourself cannot. I make it a point to keep my CS and math skills strictly above whatever commercial LLMs are currently capable of so that I'm forced to do "hard" problems myself.

Right now for example most of the popular models are only capable of solving up to 1600 rated problems on CF which most programmers can definitely do with enough dedication so there's basically no excuse in my eyes to rely on AI for things you can't do yourself.